J/A+A/557/A19   Mass and age of extreme low-mass white dwarfs   (Althaus+, 2013)

New evolutionary sequences for extremely low-mass white dwarfs: Homogeneous mass and age determinations and asteroseismic prospects. Althaus L.G., Miller Bertolami M.M., Corsico A.H. <Astron. Astrophys. 557, A19 (2013)> =2013A&A...557A..19A 2013A&A...557A..19A
ADC_Keywords: Stars, white dwarf ; Models, evolutionary ; Stars, masses ; Stars, ages ; Effective temperatures Keywords: white dwarfs - binaries: general - stars: evolution - stars: oscillations - stars: interiors Abstract: The number of detected extremely low mass (ELM) white dwarf stars has increased drastically in recent year thanks to the results of many surveys. In addition, some of these stars have been found to exhibit pulsations, making them potential targets for asteroseismology. We provide a fine and homogeneous grid of evolutionary sequences for helium (He) core white dwarfs for the whole range of their expected masses (0.15≲M*/M≲0.45), including the mass range for ELM white dwarfs (M*/M≲0.20). The grid is appropriate for mass and age determination of these stars, as well as to study their adiatabic pulsational properties. White dwarf sequences have been computed by performing full evolutionary calculations that consider the main energy sources and processes of chemical abundance changes during white dwarf evolution. Description: In file elm.dat are data presented in the middle and lower panels of Fig. 5 and 6. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file elm.dat 133 4183 Interpolated M(logTeff, logg) relation -------------------------------------------------------------------------------- See also: III/235 : Spectroscopically Identified White Dwarfs (McCook+, 2008) J/ApJ/730/67 : Radial velocities of low-mass white dwarfs (Brown+, 2011) J/ApJ/731/17 : Variability of low-mass stars in SDSS Stripe 82 (Becker+ 2011) J/ApJ/723/1072 : The ELM survey. I. Low-mass white dwarfs (Brown+, 2010) Byte-by-byte Description of file: elm.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 18 F18.16 [K] logTe [3.85,4.79] Log of effective temperature 20- 37 F18.16 [cm/s2] logg [3,7.7] Surface gravity 39- 58 F20.17 Msun Mass [0.1/0.6]?=-1 Mass fit 60- 83 E24.18 Msun e_Mass ?=-1 Mass fit error 85-108 E24.18 Myr Age ?=-1 Age fit 110-133 E24.18 Myr e_Age ?=-1 Age fit error -------------------------------------------------------------------------------- Acknowledgements: Leandro G. Althaus, althaus( at )fcaglp.unlp.edu.ar, Universidad Nacional de La Plata
(End) Emmanuelle Perret [CDS] 16-Jul-2013
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